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Check the listing for details. Spark Plug Tester Dual Hole Diagnostic Tool Gasoline Car Ignition Analyzer Test. Condition: New. Listed at 26.54 USD. Simple to use just remove rubber boot from spark plug, insert tester & place tester boot on plug. Must-have diagnostic tool for any engine with a spark plug. Leather Sewing Awl Set Replaceable Shoes Repair Punch Stitching Needle.